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Roots vacuum boosters are positive displacement pumps operating according toan essentially isochoric compression cycle (constant volume transfer) with a high pumping rate in a pressure range between 10 and 10-2 mbar . The pumping mechanism consists of two ”figure-of-eight” pistons rotating in opposite directions and synchronised through a set of gears.

The two matched-profile pistons rotate without coming into contact with each other, with a clearance of about one tenth of mm.